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Mechanical Ribbon Saver for Resistive Ribbon Printers

IP.com Disclosure Number: IPCOM000038971D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 3 page(s) / 49K

Publishing Venue

IBM

Related People

Rachui, RA: AUTHOR [+2]

Abstract

This article describes a method of achieving a "ribbon-saver" printing mode that is completely mechanical, controlled through carrier motion for a resistive ribbon-type printer. Fig. 1 schematically presents an overall view of the hardware involved. The mechanism that achieves the ribbon-saver function replaces the escapement belt idler pulley bracket (left side of figure), while the mechanism that manipulates it is mounted on the rear of the carrier, as shown. The approach is to pay out ribbon mechanism drive cable as the carrier prints from left to right in order to use less ribbon than would be used if the drive cable were simply fixed to the side plates.

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Mechanical Ribbon Saver for Resistive Ribbon Printers

This article describes a method of achieving a "ribbon-saver" printing mode that is completely mechanical, controlled through carrier motion for a resistive ribbon- type printer. Fig. 1 schematically presents an overall view of the hardware involved. The mechanism that achieves the ribbon-saver function replaces the escapement belt idler pulley bracket (left side of figure), while the mechanism that manipulates it is mounted on the rear of the carrier, as shown. The approach is to pay out ribbon mechanism drive cable as the carrier prints from left to right in order to use less ribbon than would be used if the drive cable were simply fixed to the side plates. The cable is wrapped around a spiral cable drum 10 that is gear driven by the escapement belt idler pulley 11 during the ribbon- saving draft mode and fixed during the "quality" mode. The gear ratio and pitch diameter of the cable drum have been chosen to provide a 2.5:1 ribbon-saver ratio during the draft mode. This means that 0.6 inch of cable is payed out as the carrier moves 1.0 inch toward the right.

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There are two stable positions possible for the drive cable control mechanism. Fig. 1 shows the "quality" mode position. The pawl 12 is engaged with the cable drum drive gear to prevent drum rotation. The configuration of the actuation hardware on the carrier shown will change the state of the drive cable control mechanism from "quality" to "ribbon-saver" as the carrier moves against the left side plate. Fig. 2 shows the other stable state. The pawl 12 is disengaged, and the idler gear 11 is meshed with the cable drum drive gear 13. Subsequent rotation of the escapement belt idler pulley will cause the cable drum to rotate in the same direction. The carrier-mounted actuation hardware is shown in the proper position to change the state of the drive cable control mechanism back into the "quality" mode if the carrier were to once again move completely to the left side plate. The carrier position is used to actuate the drive cable control mechanism. The maximum permissible writing line length and position is

(Image Omitted)

such that the carrier never moves against either side plate during normal printing. There is a 6 mm space remaining on the left side, and approximately
4.5 mm on the right side. Fig. 4 illustrates how carrier travel is used to manipulate the drive cable control mechanism. The first sequence of Figs. 3-5 shows how the carrier-mounted actuator changes the state of the drive cable control mechanism from "quality" to "ribbon-saver" mode. The actuator has been moved into the "latched" position by moving the carrier completely against the right side plate. This latching of the actuator will be discussed later. In Fig. 3, the carrier is 4 mm from the left side plate. The lower arm 15 of the actuator has just contacted the side of the act

(Image Omitted)

uation lever be...